Biaxial thermal creep of two heats of V4Cr4Ti at 700 and 800 °C in a liquid lithium environment

Meimei Li, T. Nagasaka, D. T. Hoelzer, M. L. Grossbeck, S. J. Zinkle, T. Muroga, K. Fukumoto, H. Matsui, M. Narui

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24 Scopus citations

Abstract

This paper presents biaxial thermal creep results for the vanadium alloy V4Cr4Ti in liquid lithium using US Heat 832665 and two batches of tubing made from NIFS-Heat-2. The tests were performed at 700 and 800 °C over a stress range of 30-120 MPa using pressurized tube specimens. Lithium environments changed C, N and O concentrations in V4Cr4Ti. Oxygen removal from the alloy to lithium was small when there was a significant pickup of nitrogen during exposures. The creep response of V4Cr4Ti was characterized by an inverted primary creep followed by a secondary creep or an accelerating creep up to creep rupture. A normal primary creep was also observed in US Heat 832665 when tested at 700 °C and 120 MPa. Improved creep rupture properties were observed in the JP-NIFS-Heat-2 specimens compared to the US-NIFS-Heat-2 specimens. Creep response of V4Cr4Ti is apparently dependent on the heat, tubing production, and stress and temperature conditions.

Original languageEnglish
Pages (from-to)788-793
Number of pages6
JournalJournal of Nuclear Materials
Volume367-370 A
Issue numberSPEC. ISS.
DOIs
StatePublished - Aug 1 2007

Funding

The research was supported by the US–Japan JUPITER II Program and by the Office of Fusion Energy Sciences, the US Department of Energy under contract DE-AC05-00OR22725 with Oak Ridge National Laboratory, managed and operated by UT-Battelle, LLC. We would like to thank L.T. Gibson and Janie Gardner for their technical support, and Drs F.W. Wiffen and T.S. Byun for their technical review.

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